2024 BOMA INSTRUMENTATION & CONTROLS EXAM
WITH 180+ QUESTIONS & CORRECT ANSWERS
A submaster controller resets the set point of the master controller.
False
Normally open refers to a controlled device that opens when no operating force is
applied.
True
A P.E. Switch is used to change an electrical signal to a pneumatic output.
False
Moisture and dirt are detrimental to the operation of pneumatic control systems.
True
A static pressure regulator senses the pressure in the plenum the regulator controls.
The sensor that indicates this pressure to this regulator is called a_____?
Static tip
The intensity of a force applied to a confined liquid or gas is transmitted equally in
all directions throughout the fluid in the form of fluid pressure. This statement is
_____?
Pascals Law
The greater the applied pressure on cylinder piston or the larger the cylinder piston
area, the greater the mechanical output force?
True
A combination starter is a switch for disconnecting and a starter mounted and one
enclosure.
True
Full load amperage of the motor is the same as starting current.
,False
A motor control circuit that is designed so that it must be restarted by pushing a
start button after a power interruption is a _____.
3 wire control
To reverse the direction of rotation of a 3 phase motor, you _____?
Interchange the connection of the motor
You have a normally closed steam humidifier valve. What action would the
hugrostat/humidistat be?
Reverse action
Sensitivity:
The PSI change in the control branch air line pressure for each degree of
temperature change felt by the sensing elements.
Static Pressure:
the outward push of air against the walls of a duct or plenum.
Accuracy:
An instrument's ability to indicate or record the actual value of a measured
quantity.
Direct Acting:
The action of a controller that increases its branch line pressure as the controlled
variable increases.
Reverse Acting:
The action of a control that decreases its branch line pressure as the controlled
variable increases
Deviation:
Departure of the control point from the set point of the amount of that departure.
Dew Point:
The temperature at which dew forms or condensation or vapor occurs.
, Span:
The temperature range through which the master operates or the submaster is
readjusted.
Relative Humidity:
The ratio expressed as a percentage of the amount of water vapor actually in the
air, to the total amount present during saturation at the same temperature
Psychrometer:
Instrument used to determine dew point and relative humidity. Consisting of a dry
bulb and wet bulb thermometer.
What is the control action of the thermostat?
?
If the hot water control valve was N/O instead of N/C what would the control
action be?
?
PS1 is what type of switch?
Electric pressure switch
Contactor coil 1 pulls in an electric strip heater on a cold air duct to a room. The
pneumatic room thermostat operates PS1. The thermostat action is what control
action?
Reverse
If we lost control power in the system above, the room temperature would _____?
Fall/decrease in temperature
In this system, if we lost control branch pressure to PS1, the room temperature
would _____?
Fall/decrease in temperature.
The transformer would be of what type?
Step down
The thermostat pictured above is best described as a _____?
WITH 180+ QUESTIONS & CORRECT ANSWERS
A submaster controller resets the set point of the master controller.
False
Normally open refers to a controlled device that opens when no operating force is
applied.
True
A P.E. Switch is used to change an electrical signal to a pneumatic output.
False
Moisture and dirt are detrimental to the operation of pneumatic control systems.
True
A static pressure regulator senses the pressure in the plenum the regulator controls.
The sensor that indicates this pressure to this regulator is called a_____?
Static tip
The intensity of a force applied to a confined liquid or gas is transmitted equally in
all directions throughout the fluid in the form of fluid pressure. This statement is
_____?
Pascals Law
The greater the applied pressure on cylinder piston or the larger the cylinder piston
area, the greater the mechanical output force?
True
A combination starter is a switch for disconnecting and a starter mounted and one
enclosure.
True
Full load amperage of the motor is the same as starting current.
,False
A motor control circuit that is designed so that it must be restarted by pushing a
start button after a power interruption is a _____.
3 wire control
To reverse the direction of rotation of a 3 phase motor, you _____?
Interchange the connection of the motor
You have a normally closed steam humidifier valve. What action would the
hugrostat/humidistat be?
Reverse action
Sensitivity:
The PSI change in the control branch air line pressure for each degree of
temperature change felt by the sensing elements.
Static Pressure:
the outward push of air against the walls of a duct or plenum.
Accuracy:
An instrument's ability to indicate or record the actual value of a measured
quantity.
Direct Acting:
The action of a controller that increases its branch line pressure as the controlled
variable increases.
Reverse Acting:
The action of a control that decreases its branch line pressure as the controlled
variable increases
Deviation:
Departure of the control point from the set point of the amount of that departure.
Dew Point:
The temperature at which dew forms or condensation or vapor occurs.
, Span:
The temperature range through which the master operates or the submaster is
readjusted.
Relative Humidity:
The ratio expressed as a percentage of the amount of water vapor actually in the
air, to the total amount present during saturation at the same temperature
Psychrometer:
Instrument used to determine dew point and relative humidity. Consisting of a dry
bulb and wet bulb thermometer.
What is the control action of the thermostat?
?
If the hot water control valve was N/O instead of N/C what would the control
action be?
?
PS1 is what type of switch?
Electric pressure switch
Contactor coil 1 pulls in an electric strip heater on a cold air duct to a room. The
pneumatic room thermostat operates PS1. The thermostat action is what control
action?
Reverse
If we lost control power in the system above, the room temperature would _____?
Fall/decrease in temperature
In this system, if we lost control branch pressure to PS1, the room temperature
would _____?
Fall/decrease in temperature.
The transformer would be of what type?
Step down
The thermostat pictured above is best described as a _____?
